import {z} from 'zod'

export type GetApiV2CoursesIdArgs = {id: string};

export type GetApiV2CoursesIdOptions = {baseUrl: string, JWTAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const courseAttributes = z.object({external_id: z.string(), title: z.string(), short_description: z.string(), long_description_html: z.string(), enforce_sequential_navigation: z.boolean(), lesson_count: z.number().int(), is_published: z.boolean(), promo_image_url: z.string(), average_rating: z.number().nullable().optional(), created_at: z.string(), modified_at: z.string()});

export const courseResource = z.object({type: z.string().optional(), id: z.string(), attributes: courseAttributes, links: z.record(z.string(), z.unknown()).nullable().optional()});

export const courseDetailResponse = z.object({data: courseResource});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Get course
 * 
 * GET /v2/courses/{id}
 */
export const getApiV2CoursesId = async (args: GetApiV2CoursesIdArgs, options: GetApiV2CoursesIdOptions) => {
const {baseUrl, fetch: fetchFn = fetch, JWTAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/vnd.api+json")

if (JWTAuth !== undefined) headers.set('authorization', `Bearer ${JWTAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/courses/${encodeURIComponent(String(args.id))}${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(courseDetailResponse, await res.json())
};